v3.20.1
Document And Entity Information - shares
3 Months Ended
Mar. 31, 2020
May 14, 2020
Document and Entity Information [Abstract]    
Entity Registrant Name ALR Technologies Inc.  
Document Type 10-Q  
Current Fiscal Year End Date --12-31  
Emerging Growth Company false  
Entity Small Business true  
Entity Common Stock, Shares Outstanding   270,777,909
Amendment Flag false  
Entity Central Index Key 0001087022  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Document Period End Date Mar. 31, 2020  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q1